<!DOCTYPE html>
<meta charset="UTF-8">
<title>font-palette interpolation</title>
<link rel="help" href="https://www.w3.org/TR/css-fonts-4/#propdef-font-palette">
<meta name="assert" content="Font-palette should be animated smoothly.">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>
<style>
@font-palette-values --custom-palette {
  font-family: "Color font";
  base-palette: 0;
  override-colors: 1 #000000;
}

.container {
  font-palette: light;
}
.container2 {
  font-palette: dark;
}
.target {
  display: inline-block;
  font: 100px sans-serif;
  font-palette: normal;
}
.expected {
  color: green;
  margin-right: 30px;
}
</style>

<body>
<template id="target-template">
  <span class="container">
    <div class="target">TT</div>
  </span>
</template>

<span id="inv-container" class="container">
  <div id="inv-target" class="target">TT</div>
</span>
</body>

<script>

test_interpolation({
  property: 'font-palette',
  from: 'light',
  to: 'dark'
}, [
  {at: -2, expect: 'light'},
  {at: -0.25, expect: 'light'},
  {at: 0, expect: 'light'},
  {at: 0.3, expect: 'palette-mix(in oklab, light, dark 30%)'},
  {at: 0.6, expect: 'palette-mix(in oklab, light, dark 60%)'},
  {at: 1, expect: 'dark'},
  {at: 1.5, expect: 'dark'},
]);

test_interpolation({
  property: 'font-palette',
  from: 'initial',
  to: 'inherit'
}, [
  {at: -2, expect: 'normal'},
  {at: -0.25, expect: 'normal'},
  {at: 0, expect: 'normal'},
  {at: 0.3, expect: 'palette-mix(in oklab, normal, light 30%)'},
  {at: 0.6, expect: 'palette-mix(in oklab, normal, light 60%)'},
  {at: 1, expect: 'light'},
  {at: 1.5, expect: 'light'},
]);

test_interpolation({
  property: 'font-palette',
  from: '--custom-palette',
  to: 'normal'
}, [
  {at: -2, expect: '--custom-palette'},
  {at: -0.25, expect: '--custom-palette'},
  {at: 0, expect: '--custom-palette'},
  {at: 0.3, expect: 'palette-mix(in oklab, --custom-palette, normal 30%)'},
  {at: 0.6, expect: 'palette-mix(in oklab, --custom-palette, normal 60%)'},
  {at: 1, expect: 'normal'},
  {at: 1.5, expect: 'normal'},
]);

/* palette-mix function for the equal endpoints should be simplified. */
test_interpolation({
  property: 'font-palette',
  from: 'initial',
  to: 'normal'
}, [
  {at: -2, expect: 'normal'},
  {at: -0.25, expect: 'normal'},
  {at: 0, expect: 'normal'},
  {at: 0.3, expect: 'normal'},
  {at: 0.6, expect: 'normal'},
  {at: 1, expect: 'normal'},
  {at: 1.5, expect: 'normal'},
]);

test(t => {
  var container = document.getElementById('inv-container');
  var target = document.getElementById('inv-target');
  var anim = target.animate({ fontPalette: ['normal', 'inherit'] }, 1000);
  anim.pause();
  anim.currentTime = 500;
  assert_equals(getComputedStyle(target).fontPalette, 'palette-mix(in oklab, normal, light)');

  container.setAttribute('class', 'container2');
  assert_equals(getComputedStyle(target).fontPalette, 'palette-mix(in oklab, normal, dark)');
}, "An interpolation to inherit updates correctly on a parent style change.");

test(t => {
  var target = document.getElementById('inv-target');
  target.animate(
    { fontPalette: ['light', 'normal'] },
    {
      duration: 1000
    }
  );
  target.animate(
    { fontPalette: ['normal', 'dark'] },
    {
      duration: 1000,
      /* Should work like 'replace', since <Color> type is not additive,
         compare: https://drafts.csswg.org/css-values-4/#combine-colors. */
      composite: "add"
    }
  );
  document.getAnimations().forEach((animation) => {
    animation.pause();
    animation.currentTime = 500;
  });
  assert_equals(getComputedStyle(target).fontPalette,
                "palette-mix(in oklab, normal, dark)");
}, "Test additive animations");

</script>